Screening device for bag filling machines



July,l5, 1941. J. J. NEUMAN SCRE'WING DEVICE-.FOR BAG FILLING MACHINES Filed May 20; 1939 2 Sheets-Sheet 1 y 15, 1941- J. J. NEUMAN 2,249,715

SCREENING DEVICE FOR BAG FILLING MACHINES Filed May 20, 1939 2 Sheets-Sheet 2 m wk l/V 1 5N701? kroifjlzzmdn fiu v ATTORNEY Patented July 15, 1941 SCREENING DEVICE FOR BAG MACHINES .Iacob J. Neuman, South Salem, N. Y., assignor to United States Patent Development and Royalty Company, South Salem, N. Y., a company Application- May 20,1939, Serial No. 274,688

' 4 Claims. (c1, 209-358) The invention relates to bag, filling and closing. apparatus and more especially to auxiliary equipment for use with a bag filling and sewing machine as will be more fully pointed. out below and comprises additions and improvements to the disclosures of my Patent'Number 1,823,283 andcopending application, Serial Number 1 57,.-

480, filedVAugust 5,, 1937, and application Serial;v

Number 246,,445, filedDecem-ber 17,1938.

An .object of this invention is to provide an efiicient "and compact screening device for screening the material fed to an automatic scale from.

a bin or other reservoir which device embodies.

means. for continuously cleaning the screen for the purpose of preventing'clogging and for re 16.;

ducing lumps to a size which will: readilypass throughthe screen.

In the first place, sugar, or other subdivided solid, is fedfrom a bin toscales through a screen of improved structure. In this screen lumps are broken and foreign matter of large particle size is discarded. The screen is adjustable to handle various grades of solids. Furthermore, the screen part itself is protected against breakage by, the,

movable construction of the other parts.

In the drawings wherein like characters of reference refer to the same parts throughout the several views:

Figure 1 is a plan view of the screen cleaner and drive therefor.

Figure 2 is a vertical section taken on the line 2-2 of Fig. 1.

Figure 3 is a vertical section taken on the line 3-3 of Figure 1.

Referring to the drawing in Figures 1, 2 and 3 I have shown the details of the screening device which consists of the substantially round casing or housing 301 to the lower side of which the screen 305 is secured between the clamping ring 301 and the angular supporting ring 304 which is fastened to said housing by the screws 308. A desirable munber of studs 306 are provided to secure the clamping ring 301 and angular supporting ring 304 together, between which the screen 305 is held. Members 325, welded to the angular supporting ring 304, extend crosswise under the screen 305 to support and stiffen it further against bending stresses due to the Weight of sugar above and the wedging action of small lumps. The rotating spider member 303 positioned slightly above the screen 305 consists of the rim 3030 the spokes 3031) and the hub 3030, the bottom surfaces of said rim and spokes being flat and in the same plane. The spider member 303 is secured to the shaft 3l6 by the pin/3 l'l, said shaft extending up through the center of the housing-301 into .the gear reduction unit 326 and being driven by the motor 326a. The: pin 3H fits in the slot 334 of the hub 3030 of thespider 303. Other slots of varying depths suchas the slot 334a are provided in the hub and form a means of adjusting the clearance between the bottom of the spider 303 and the screen 335 the clearance used dependingv on the material being screened. When it is desired to change theclearance the cotter pin 328 is re moved and: the spider 303 is raised. up until the pin 3" disengages the slot 334. The spider303' is then: turned on the shaft 31-3 and the proper number of degrees until the slot of the desired depth is opposite the pins 311 and is then dropped down and the cotter pin 328 replaced. Another feature of this is that, since the spider 303 is free to slide up the shaft 316 as far as the cotter pin 328, if any particularly unyielding lumps: or foreign ob-jfects'get wedged between the spokes 30312; or-the rim 303a of the spider 303, said spider 303 will yield by sliding up the shaft 346': instead of rupturing the screen- 305.

The housing 30 has a recess formed around the shaft, 310 containing, the grease retaining packing rings 323, 32 4- and 32 9 to prevent lubricant from leaking down from the gear reducer unit 320 above.

The housing 30| has the top thereof provided with two diametrically opposite openings for inspection purposes, said openings being closed by the covers 302 retained by means of the springs- 315 held by the nuts 309 and bolts 314. Cotter pins 3| 0 hold the nuts 309 in adjustment.

In operation material to be screened is fed through the duct 332 into the top of the housing 30l where the material which is sufficiently fine passes through the screen 305 immediately. The lumps are carried or rolled around on the screen 305 by the spokes 30312 of the rotating spider 303 until they are sufficiently broken up to pass through said screen 305. In the event that the lumps become so numerous that they pile up above the rim 303a of the spider 303 they are thrown off by centrifugal force into the extended portion 30m of the housing 301 and may be permitted to fall through the duct 333 into any suitable receptacle by opening the gate 330.

, From the foregoing description, taken in connection with the accompanying drawings, the several objects and advantages of my invention and the method of their accomplishment will be clearly manifest, it being understood that the particular constructions set forth are susceptible of modification in various ways without departing from the spirit or scope of the invention as claimed.

What is claimed is:

1. In a device for bag filling machines and the like, a screen, a casing for the screen, a duct connected to said casing to supply material to the screen through an opening in said casing, a rotatable shaft in the casing perpendicular to the screen, a spider comprising a hub and radiating arms, said hub having a bore to fit over the lower end of the shaft, said hub further having at least two slots of different depths transverse of the bore and opening downwardly, a pin on the shaft adapted to engage in either of said slots to support the spider a predetermined distance above the screen, and means on the shaft above the spider to limit upward movement of the spider on the shaft, said means being located at a position above the hub of the spider to prevent the spider from being raised sufficiently to lift said pin out of any of said slots.

2. In a device of the character described, a screen for receiving and sizing material, a rotating spider member having a continuous rim positioned above said screen and adapted to cause rotation of lumps of material on the screen to reduce the same to screen size by wedging and agitating, said rim being of uniform depth around the entire circumference,'the bottom surfaces of said spider member and rim being fiat and in the same plane and adapted at a predetermined depth of accumulated lumps of material choking the screen to discharge same from above the screen by centrifugal force, receiving means positioned upon the outer limits of said screen and rotating member to receive the accumulated lumps, and discharge means for said receiving means.

3. In a device of the character described, a screen for receiving'and sizing material, a rotating spider member having a continuous rim positioned above said screen and adapted to cause rotation of lumps of material on the screen to reduce the same to screen size by wedging and agitating, said rim being of uniform depth around the entire circumference, the bottom surfaces of said spider member and said rim being fiat and in the same plane and adapted at a predetermined depth of accumulated lumps of material choking the screen to discharge same from above the screen by centrifugal force, receiving means positioned upon the outer limits of said screen and rotating member toreceive the accumulated lumps, discharge means for said receiving means, a shaft for rotating said member, said member having a bore adapted to permit free upward movement of said member on said shaft, connecting means carried by the lower end of said shaft, mounting means on said member adapted to permit locking of said rotating member by the connecting means of said shaft in various positions to support the rotating member on the shaft at predetermined spaced distances above the screen, and means on the shaft above said rotating member to limit the free upward movement of said rotating member, said means beinglocated at a position above the member to prevent said member from being raised sufiicient- 1y to lift said connecting means out of said mounting means. 1

4. In a device of the character described, a screen for receiving and. sizing material, a rotating membercomprising a hub and arms extending transversely of said screen, said member having a continuous rim of uniform depth around the entire circumference, the bottom surfaces of said arms and rim being flat and in the same plane and adapted at a predetermined depth of accumulated lumps of material choking the screen to discharge same from above the screen by centrifugal force, said member being positioned above said screen and being maintained out of contact therewith, mounting means including a shaft for said rotating member adapted to permit free upward movement of said member for a predetermined distance upon the shaft, said mounting means further adapted to permit locking of said rotating member in various predetermined distances above the screen and out of contact therewith, and means to limit the free upward movement of said member on said shaft, said last-mentioned means being located at a position above the rotating member to prevent unlocking of same from the selected predetermined position above the screen.

JACOB J. NEUMAN. 

